Question about GMC Sierra

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Replaced master cylinder shoes pads wheel cylinder & booster & the brakes still go to the floor. in a 88 gmc 1/2 ton 4 whl drive sierra.

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  • GMC Master
  • 5,763 Answers

The first thing to check is the brake lines, this lines rot and leak fluid, most times its the line going to rear wheels that runs along side of fuel tank along the frame,

Posted on May 30, 2010

  • davidjose69 May 30, 2010

    brake pedal goes to floor even when the truck is off, and it doesnt want to come back up.

  • Johnny    Brown
    Johnny Brown Jun 01, 2010

    remove the master cylinder, use a screw driver and push in on the rear of master as the rod would,does it spring back out, if it does then thats okay,then i would also make sure the brake pedal linkage is hooked up correctly,if thats okay then i would say there a problem with the booster,but even with a bad booster the pedal shouldnt go to floor unless there a bad line or lots of air in the system,and last is the porportioning valve may be stuck,but again the spring load in the master should push the brake pedal back up,maybe a bad master, i would start from the begining and double check everything starting with the master cylinder and the pedal linkage.

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